Word after "gray" or "Bay" (4)
I believe the answer is:
area
'word after gray or bay' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for area that I've seen before include "Extent of a two-dimensional surface" , "Expanse or neighbourhood" , "The measure of a surface" , "topic" , "Region, space" .)